Malicious PDF — malware analysis report

Static analysis result for SHA-256 118836eae3bebbb5…

MALICIOUS

PDF

80.3 KB Created: 2021-09-10 04:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 928122702ccbe2f649d0ccae4075187d SHA-1: 1b35f6a13d75031620367459b2e50497f0dfe3cd SHA-256: 118836eae3bebbb541776e42a3c07aba0056f97d2f883277a7bf86d582348d43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms and the overall detection by security tools indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://himalayanthailand.com/image/upload/File/59810229291.pdf In PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/n2qn3b5j19jhi7nevorao7flo4/2329312388.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/suvatevepijamujojepizoxiv.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/xokagetogejojulozomewapab.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/karifov.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/70273420770.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/460d6a54140f0cc2825964daf502ac34/47680876848.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/66745345194.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/najumedi.pdfIn PDF document text
    • http://atya.eu/files/file/41822328594.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/weviwivijonadibomanut.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/70711265271.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/jodewawewasukibafo.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/pipuzurajodugifo.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/litobuzabakunaduwo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139103f9529d---rupebofojas.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/73979446333.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/sopigojeg.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/49340062975.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e5f90356f441011f7afc1135494f653c/8330722325.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161334f1d6db2d---10871448435.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/10420424335.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210902063420453.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/nilebovodo.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f452252a0---91519819433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=meilleur+application+pour+regarder+la+tv+sur+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA3 10848 bytes
SHA-256: 88c4f8cb147cb7b215299bb2269dcaa70b9c749df15ea4fc15035b0c678d03da
font_01_sfnt_off0000e79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79D 19992 bytes
SHA-256: 24fa6b3e548364e56787f5f1b37bfb197f1713e0480bedf5ffd203e01c12ce11
font_02_sfnt_off00011a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1